1. A classic 2x3 proportion friendly to the 35mm professional photography frame format.

2. Ubiquitous format by default for photography, not large enough to to be an enlargement and not small enough to be in any way precious.

3. A failed 5x7"

4. A flabby 3.5x5"

5. "Neither here nor there" a form of mediocrity which becomes the norm because things "need to change"

6. Replacer of 3.5x5", extra photography real-estate, a new sell without improvement.

7. Related. "TV Proportions"